This article shows the steps to take if Microsoft Security Essentials will not install. To do this, you will need to remove any Internet security programs, make sure the Windows installer service is running, and start Windows in selective startup mode.

Remove ALL Internet Security Programs:

1. In Windows XP, click Start, click Run, in the search bar, type "appwiz.cpl" and click Enter.
In Windows 7 type "appwiz.cpl" into the Search box, within the Start menu, and clicking Enter.

NOTE: Some Internet security programs may not uninstall completely. To remedy this situation, cleanup utilities may need to be installed and run, for the security application to be removed completely.

NOTE:When removing Internet security programs, your computer is not protected. If Microsoft Security Essentials, still does not install, even after the removal of these security programs, you need to submit a case to Microsoft Security Essentials Support, immediately.

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